Note 3 - Loans and Allowance for Credit Losses - Nonaccrual Loans (Details)	Mar. 31, 2022 USD ($)
Recorded Principal Balance, With no Allowance Recorded	$ 1,587,000
Recorded Principal Balance, With Allowance Recorded	25,000
Financing Receivable, Nonaccrual, Allowance	25,000
Nonaccrual loans	1,612,000
Commercial Portfolio Segment [Member]
Recorded Principal Balance, With no Allowance Recorded	0
Recorded Principal Balance, With Allowance Recorded	0
Financing Receivable, Nonaccrual, Allowance	0
Nonaccrual loans	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Recorded Principal Balance, With no Allowance Recorded	0
Recorded Principal Balance, With Allowance Recorded	0
Financing Receivable, Nonaccrual, Allowance	0
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Recorded Principal Balance, With no Allowance Recorded	0
Recorded Principal Balance, With Allowance Recorded	0
Financing Receivable, Nonaccrual, Allowance	0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Recorded Principal Balance, With no Allowance Recorded	0
Recorded Principal Balance, With Allowance Recorded	0
Financing Receivable, Nonaccrual, Allowance	0
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Recorded Principal Balance, With no Allowance Recorded	0
Recorded Principal Balance, With Allowance Recorded	0
Financing Receivable, Nonaccrual, Allowance	0
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Recorded Principal Balance, With no Allowance Recorded	0
Recorded Principal Balance, With Allowance Recorded	0
Financing Receivable, Nonaccrual, Allowance	0
Retail Portfolio Segment [Member]
Recorded Principal Balance, With no Allowance Recorded	1,587,000
Recorded Principal Balance, With Allowance Recorded	25,000
Financing Receivable, Nonaccrual, Allowance	25,000
Nonaccrual loans	1,612,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Recorded Principal Balance, With no Allowance Recorded	1,585,000
Recorded Principal Balance, With Allowance Recorded	25,000
Financing Receivable, Nonaccrual, Allowance	25,000
Retail Portfolio Segment [Member] | Other Consumer Loans [Member]
Recorded Principal Balance, With no Allowance Recorded	2,000
Recorded Principal Balance, With Allowance Recorded	0
Financing Receivable, Nonaccrual, Allowance	$ 0